Maxim MAX1667EAP Datasheet

General Description

The MAX1667 provides the power control necessary to charge batteries of any chemistry. All charging functions are controlled through the Intel System Management Bus (SMBus™) interface. The SMBus 2-wire serial interface sets the charge voltage and current and provides thermal status information. The MAX1667 functions as a Level 2 charger, compliant with the Duracell/Intel Smart Battery Charger Specification.

In addition to the feature set required for a Level 2 charger, the MAX1667 generates interrupts to signal the host when power is applied to the charger or when a battery is installed or removed. Additional status bits allow the host to check whether the charger has enough input voltage, and whether the voltage on or current into the battery is being regulated. This allows the host to determine when lithium-ion (Li+) batteries have completed the charge without interrogating the battery.

The MAX1667 is available in a 20-pin SSOP with a 2mm profile height.

________________________Applications

Notebook Computers Charger Base Stations Personal Digital Assistants Phones

____________________________Features

♦ Charges Any Battery Chemistry: Li+, NiCd,

NiMH, Lead Acid, etc.

♦ SMBus 2-Wire Serial Interface ♦ Compliant with Duracell/Intel Smart Battery

Charger Specification Rev. 1.0

♦ 4A, 3A, or 1A (max) Battery Charge Current ♦ 5-Bit Control of Charge Current ♦ Up to 18.4V Battery Voltage ♦ 11-Bit Control of Voltage ♦ ±1% Voltage Accuracy ♦ Up to +28V Input Voltage ♦ Battery Thermistor Fail-Safe Protection ♦ Greater than 95% Efficiency ♦ Synchronous Rectifier

MAX1667

Chemistry-Independent,

Level 2 Smart Battery Charger

________________________________________________________________

Maxim Integrated Products

Typical Operating Circuit

PART

MAX1667EAP -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

20 SSOP

Ordering Information

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.

SMBus is a trademark of Intel Corp.

19-1488; Rev 0; 7/99

MAX1667

DCIN

REF BST

DHI

DLO

PGND

INT

BATT

SCL SDA

THM

IOUT

CHARGE SOURCE

AGND

SEL

DACV

CCV

CCI

HOST

CONTROLLER

SMART

BATTERY

SCL

SDA

INT GND

BATT+

SENSE

SCL SDA TEMP BATT-

Pin Configuration appears at end of data sheet.

MAX1667

Chemistry-Independent, Level 2 Smart Battery Charger

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

DCIN

= 18V, internal reference, 1µF capacitor at REF, 1µF capacitor at VL, TA= 0°C to +85°C, unless otherwise noted. Typical values

are at T

= +25°C, unless otherwise noted.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

DCIN to AGND .......................................................-0.3V to +30V

BST to AGND..........................................................-0.3V to +36V

BST, DHI to LX..........................................................-0.3V to +6V

LX, IOUT to AGND..................................................-0.3V to +30V

THM, CCI, CCV, DACV, REF,

DLO to AGND .............................................-0.3V to (VL + 0.3V)

VL, SEL, INT, SDA, SCL to AGND............................-0.3V to +6V

BATT, CS+ to AGND ..............................................-0.3V to +20V

PGND to AGND.....................................................-0.3V to +0.3V

SDA, INT Current ................................................................50mA

VL Current...........................................................................50mA

Continuous Power Dissipation (T

= +70°C)

SSOP (derate 8mW/°C above +70°C) ..........................640mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

-0.8 0.8

ChargingVoltage() = 0x3130 (12,592mV) and 0x41A0 (16,800mV)

Voltage Accuracy

mV5ChargingCurrent() = 0x0080 (128mA)

CS to BATT Single-Count Current-Sense Voltage

V019BATT, CS Input Voltage Range

µA

350 500VL > 5.15V, V

BATT

= 12V

BATT Input Current (Note 1)

15VL < 3.2V, V

BATT

= 12V

Ω58High or lowDLO On-Resistance

Ω47High or lowDHI On-Resistance

mA467.5V < V

DCIN

< 28V, logic inputs = VLDCIN Quiescent Current

V7.5 28DCIN Input Voltage Range

%96.5 97.7In dropoutDHI Maximum Duty Cycle

kHz200 250 300Not in dropoutOscillator Frequency

V5.15 5.4 5.657.5V < V

DCIN

< 28V, no loadVL Output Voltage

mV100I

LOAD

= 0 to 10mAVL Load Regulation

V3.20 4 5.15VL AC_PRESENT Trip Point

4.055 4.096 4.137

UNITSMIN TYP MAXCONDITIONSPARAMETER

µA

170 400VL > 5.15V, VCS= 12V

CS Input Current (Note 1)

15VL < 3.2V, VCS= 12V

mV145 160 175

SEL = VL (4A), ChargingCurrent() = 0x0F80 (3968mA)

CS to BATT Full-Scale Current-Sense Voltage

V0 < I

SOURCE

< 500µAREF Output Voltage

TA= +25°C

TA= T

MIN

to T

MAX

-1.0 1.0

TA= +25°C

TA= T

MIN

to T

MAX

-3.0 3.0

-1.0 1.0

ChargingVoltage() = 0x1060 (4192mV) and 0x20D0 (8400mV)

SWITCHING REGULATOR

SUPPLY AND REFERENCE

MAX1667

Chemistry-Independent,

Level 2 Smart Battery Charger

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

DCIN

= 18V, internal reference, 1µF capacitor at REF, 1µF capacitor at VL, TA= 0°C to +85°C, unless otherwise noted. Typical values

are at T

= +25°C, unless otherwise noted.)

Note 1: When DCIN is less than 4V, VL is less than 3.2V, causing the battery current to be typically 2µA (CS plus BATT input

current).

Bits11Guaranteed monotonicVDAC Voltage-Setting DAC Resolution

Bits5Guaranteed monotonicCDAC Current-Setting DAC Resolution

mA5

mA579

% of

REF

3 4.5 6THM falling

THM THERMISTOR_UR Underrange Trip Point

% of

REF

22 23.5 25THM falling

THM THERMISTOR_HOT Trip Point

% of

REF

74 75.5 77THM falling

THM THERMISTOR_COLD Trip Point

mA/V0.2GMI Amplifier Transconductance

mA/V1.4GMV Amplifier Transconductance

% of

REF

89 91 93THM falling

THM THERMISTOR_OR Overrange Trip Point

% of

DCIN

93 95 97BATT risingBATT POWER_FAIL Threshold

µA±80

GMV Amplifier Maximum Output Current

µA±200

GMI Amplifier Maximum Output Current

mV25 80 2001.1V < V

CCI

< 3.5V

CCV Clamp Voltage with Respect to CCI

UNITSMIN TYP MAXCONDITIONSPARAMETER

mA6V

SDA

= 0.6VSDA Output Low Sink Current

µA-1 1SDA, SCL Input Bias Current

V2.2SDA, SCL Input Voltage High

V0.8SDA, SCL Input Voltage Low

mV25 80 2001.1V < V

CCV

< 3.5V

CCI Clamp Voltage with Respect to CCV

ChargingCurrent() = 0x0000 10 µA

ChargingCurrent() = 0x0001 to 0x007F (127mA)

IOUT

= 17V, ChargingCurrent() = 0x0001

to 0x007F (127mA) V

DCIN

= 0, V

IOUT

= 20V µA10IOUT Leakage Current

IOUT

= 0

IOUT Output Current

% of

DCIN

0.5

THM THERMISTOR_OR, _COLD, _HOT, _UR Trip Point Hysteresis

% of

DCIN

BATT POWER_FAIL Threshold Hysteresis

ERROR AMPLIFIERS

TRIP POINTS AND LINEAR CURRENT SOURCES

CURRENT- AND VOLTAGE-SETTING DACs

LOGIC LEVELS

MAX1667

Chemistry-Independent, Level 2 Smart Battery Charger

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

DCIN

= 18V, internal reference, 1µF capacitor at REF, 1µF capacitor at VL, TA= -40°C to +85°C, unless otherwise noted. Typical values

are at T

= +25°C. Limits over this temperature range are guaranteed by design.)

µACS Input Current (Note 1) 5VL < 3.2V, VCS= 12V

mV145 160 175

SEL

= VL,

ChargingCurrent() = 0x0F80 (128mA)

CS to BATT Full-Scale Current-Sense Voltage

-1.0 1.0

ChargingVoltage() = 0x3130 (12,592mV), ChargingVoltage() = 0x41A0 (16,800mV)

Voltage Accuracy

µABATT Input Current (Note 1) 5VL < 3.2V, V

BATT

= 12V

Ω58High or lowDLO On-Resistance

Ω47High or lowDHI On-Resistance

mA467.5V < V

DCIN

< 28V, logic inputs = VLDCIN Quiescent Current

%96.5In dropoutDHI Maximum Duty Cycle

kHz200 250 310Not in dropoutOscillator Frequency

V5.15 5.4 5.657.5V < V

DCIN

< 28V, no loadVL Output Voltage

V4.055 4.1370 < I

SOURCE

< 500µAREF Output Voltage

UNITSMIN TYP MAXCONDITIONSPARAMETER

% of

REF

88.5 93.5THM falling

THM THERMISTOR_OR Overrange Trip Point

% of

REF

73.5 77.5THM falling

THM THERMISTOR_COLD Trip Point

V0.5SDA, SCL Input Voltage Low V2.2SDA, SCL Input Voltage High

µA-1 1SDA, SCL Input Bias Current

% of

REF

21.5 25.5THM falling

THM THERMISTOR_HOT Trip Point

% of

REF

2.5 6.5THM falling

THM THERMISTOR_UR Underrange Trip Point

mA6V

SDA

= 0.6VSDA Output Low Sink Current

THM THERMISTOR_OR, _COLD, _HOT, _UR Trip Point Hysteresis

-3.0 3.0

ChargingVoltage() = 0x1060 (4192mV), ChargingVoltage() = 0x20D0 (8400mV)

SUPPLY AND REFERENCE

SWITCHING REGULATOR

TRIP POINTS AND LINEAR CURRENT SOURCES

LOGIC LEVELS

MAX1667

Chemistry-Independent,

Level 2 Smart Battery Charger

_______________________________________________________________________________________ 5

TIMING CHARACTERISTICS (Figures 1 and 2)

(TA= 0°C to +85°C, unless otherwise noted.)

TIMING CHARACTERISTICS (Figures 1 and 2)

(TA= -40°C to +85°C, unless otherwise noted. Limits over this temperature range are guaranteed by design.)

CONDITIONS

µs1t

SCL Falling Edge to SDA Valid, Master Clocking in Data

ns0t

HD:DAT

SCL Falling Edge to SDA Transition

µs4.7t

SU:STA

Start-Condition Setup Time

µs4.7t

LOW

µs4t

HIGH

SCL Serial-Clock High Period SCL Serial-Clock Low Period

µs4t

HD:STA

Start-Condition Hold Time

ns250t

SU:DAT

SDA Valid to SCL Rising-Edge Setup Time, Slave Clocking in Data

UNITSMIN TYP MAXSYMBOLPARAMETER

CONDITIONS

µs4.7t

SU:STA

Start-Condition Setup Time

µs4.7t

LOW

UNITSMIN TYP MAXSYMBOLPARAMETER

SCL Serial-Clock Low Period

µs4t

HD:STA

Start-Condition Hold Time

µs4t

HIGH

SCL Serial-Clock High Period

ns250t

SU:DAT

SDA Valid to SCL Rising-Edge Setup Time, Slave Clocking in Data

ns0t

HD:DAT

SCL Falling Edge to SDA Transition

µs1t

SCL Falling Edge to SDA Valid, Master Clocking in Data

MAX1667

Chemistry-Independent, Level 2 Smart Battery Charger

6 _______________________________________________________________________________________

Figure 2. SMBus Serial-Interface Timing—Acknowledge

SLAVE PULLING SDA LOW

MOST SIGNIFICANT BIT

OF DATA CLOCKED

INTO MASTER

ACKNOWLEDGE

BIT CLOCKED INTO MASTER

RW BIT

CLOCKED

INTO SLAVE

SCL

SDA

START

CONDITION

MOST SIGNIFICANT

ADDRESS BIT (A6)

CLOCKED INTO SLAVE

A5 CLOCKED

INTO SLAVE

A4 CLOCKED

INTO SLAVE

A3 CLOCKED

INTO SLAVE

HIGH

LOW

HD:STA

SU:STA

SU:DAT

HD:DAT

SCL

SDA

SU:DAT

HD:DAT

Figure 1. SMBus Serial-Interface Timing—Address

MAX1667

Chemistry-Independent,

Level 2 Smart Battery Charger

_______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

(Circuit of Figure 7, TA = +25°C, unless otherwise noted.)

(VOLTAGE REGULATION WITH CURRENT LIMIT)

10V

5V/div

DCIN

ChargingVoltage() = 12,000mV ChargingCurrent() = 1500mA

CCI

CCV

= 18V

LOAD TRANSIENT

CCV

CCI

CCV

CCI

BATT

LOAD

AVERAGED MEASUREMENT

500µs/div

CCI

CCV

MAX1667TOC01

200mV/div

1.4V

1A 1A/div

(WITH CHANGE IN REGULATION LOOP)

LOAD TRANSIENT

CCV

CCI

LOAD

10V

5V/div

= 18V

DCIN

ChargingVoltage() = 12,000mV ChargingCurrent() = 1500mA

CCI

CCV

BATT

AVERAGED MEASUREMENT

1ms/div

MAX1667TOC02

CCV

CCI

50mV/div

1A 500mA/div

VL LINE REGULATION

5.450 NO LOAD

5.425

5.400

VL (V)

5.375

5.350

010155 202530

(V)

DCIN

VL vs. TEMPERATURE

5.45

5.44

5.43

5.42

5.41

5.40

VL (V)

5.39

5.38

5.37

5.36

5.35

-40 -20 0 20 40 60 80 100 TEMPERATURE (°C)

DCIN

= 20V

MAX1667 TOC03

MAX1667 TOC05

VL LOAD REGULATION

5.50

5.45

5.40

5.35

VL (V)

5.30

5.25

5.20 0105 152025

LOAD CURRENT (mA)

LOAD REGULATION

REF

0 0.80.60.2 0.4 1.0 1.2 1.4 1.6 1.8 2.0

LOAD CURRENT (mA)

(V)

4.11

4.10

4.09

REF

4.08

4.07

4.06

= 20V

DCIN

MAX1667 TOC04

MAX1667 TOC06

MAX1667

Chemistry-Independent, Level 2 Smart Battery Charger

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 7, TA = +25°C, unless otherwise noted.)

100

0.01

1.0

0.1

0.001

0 400 800 1200 1600 2000

OUTPUT V-I CHARACTERISTIC

(SWITCHING REGULATOR)

MAX1667 TOC10

LOAD CURRENT (mA)

DROP IN BATT OUTPUT VOLTAGE (%)

DCIN

= 20V ChargingVoltage() = 17,408mV ChargingCurrent() = 1920mA V

REF

= 4.096V

02468101214161820

OUTPUT V-I CHARACTERISTIC

(LINEAR SOURCE)

MAX1667 TOC11

IOUT

(V)

IOUT

(mA)

DCIN

= 20V ChargingVoltage() = 17,408mV ChargingCurrent() = 1 to 127mA

4.080

4.100

4.085

4.090

4.095

4.110

-40 4020-20 0 60 80 100

REF

vs. TEMPERATURE

MAX1667 TOC07

TEMPERATURE (°C)

REF

(V)

4.105

DCIN

= 20V

100

0 20001000 3000 4000

EFFICIENCY vs. LOAD CURRENT

(VOLTAGE REGULATION)

MAX1667 TOC08

LOAD CURRENT (mA)

EFFICIENCY (%)

A: V

DCIN

= 20V, V

BATT

= 17V

B: V

DCIN

= 16V, V

BATT

= 12.75V

C: V

DCIN

= 20V, V

BATT

= 12.75V

D: V

DCIN

= 16V, V

BATT

= 8.5V

E: V

DCIN

= 20V, V

BATT

= 8.5V

100

0862 4 10 12 18

EFFICIENCY vs. BATT VOLTAGE

(CURRENT REGULATION)

MAX1667 TOC09

BATT VOLTAGE (V)

EFFICIENCY (%)

14 16

A: V

DCIN

= 16V, I

LOAD

= 2A

B: V

DCIN

= 20V, I

LOAD

= 2A

C: V

DCIN

= 20V, I

LOAD

= 600mA

BATT VOLTAGE ERROR (%)

BATT VOLTAGE ERROR

vs. ChargingVoltage() CODE

1.0

0.8

= 20V

DCIN

MEASURED AT AVAILABLE

0.6 ChargingVoltage() CODES

0.4

0.2

-0.2

-0.4

-0.6

-0.8

-1.0 0 4k6k8k2k 10k 12k 14k 18k16k 20k

ChargingVoltage() CODE

LOAD

= 600mA

= 3mA

MAX1667 TOC12

LOAD CURRENT ERROR

BATT CURRENT ERROR (%)

-5

=20V

DCIN

= 12.75V

BATT

MEASURED AT AVAILABLE ChargingCurrent() CODES

0 1000 2000 3000500 1500 2500 3500 4000

CODE

MAX1667 TOC13

MAX1667

Chemistry-Independent,

Level 2 Smart Battery Charger

_______________________________________________________________________________________ 9

Pin Description

Linear Current-Source Output1 IOUT Input Voltage for Powering Charger2 DCIN

Voltage-Regulation-Loop Compensation Point4 CCV

IC Power Supply. 5.4V linear-regulator output from DCIN.3 VL

Current-Range Selector. Connecting SEL to VL sets a 4A full-scale current. Leaving SEL open sets a 3A full-scale current. Connecting SEL to AGND sets a 1A full-scale current.

6 SEL

Battery Voltage Input and Current-Sense Negative Input8 BATT

Current-Sense Positive Input7 CS

Current-Regulation-Loop Compensation Point5 CCI

+4.096V Reference Voltage Output or External Reference Input9 REF

Open-Drain Interrupt Output11

INT

Analog Ground10 AGND

Thermistor Sense Voltage Input12 THM

Serial Data (need external pull-up resistor)14 SDA

Power Ground16 PGND

Voltage DAC Output Filtering Point15 DACV

Serial Clock (need external pull-up resistor)13 SCL

High-Side Power MOSFET Driver Output18 DHI

Power Connection for the High-Side Power MOSFET Driver20 BST

Power Connection for the High-Side Power MOSFET Driver19 LX

Low-Side Power MOSFET Driver Output17 DLO

FUNCTIONPIN NAME

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